期刊論文
| 學年 | 114 |
|---|---|
| 學期 | 2 |
| 出版（發表）日期 | 2026-03-09 |
| 作品名稱 | The ALMaQUEST Survey. XVII. Unveiling Multiple Quenching Pathways in Green Valley Galaxies via Molecular Gas and Quenching Timescale Analyses |
| 作品名稱（其他語言） | |
| 著者 | Lihwai Lin; Po-Feng Wu; Mallory D. Thorp; Asa F. L. Bluck; Hsi-An Pan; Sara L. Ellison; Kate Rowlands; Justin Atsushi Otter; Sebastián F. Sánchez |
| 單位 | |
| 出版者 | |
| 著錄名稱、卷期、頁數 | The Astrophysical Journal 999(2), p. 15 |
| 摘要 | Statistically, green valley (GV) galaxies exhibit lower molecular gas fractions (fgas) and reduced star formation efficiency (SFE) compared to star-forming galaxies. However, it remains unclear whether quenching is primarily driven by one factor or results from a combination of mechanisms in individual GV galaxies. In this study, we address this question by examining the spatial distributions of star formation and molecular gas in 28 GVs selected from the ALMaQUEST survey and additional literature samples. For each galaxy, we identify regions with suppressed specific star formation rate (sSFR) and measure Δfgas and ΔSFE—offsets from the resolved scaling relations of the star-forming main-sequence galaxies. By comparing the fraction of regions with negative Δfgas and ΔSFE, we classify 35.7% ± 13.2% (57.1% ± 17.9%) of GV galaxies as fgas driven, 39.3% ± 14.0% (39.3% ± 14.0%) as SFE driven, and 25.0% ± 10.6% (3.6% ± 3.6%) as mixed mode when adopting a fixed (variable) CO-to-H2 conversion factor (αCO). These results indicate that GVs undergo quenching through multiple pathways. As sSFR decreases from the main sequence to the GV, we observe a transition toward predominantly SFE-driven quenching, possibly linked to internal processes such as morphological quenching or active galactic nucleus activity. We further estimate the quenching timescale (τdecay), defined as the time from the peak star formation rate to 1 e–1 (approximately 37%) of its value, using integrated MaNGA spectra. SFE-driven quenching is typically associated with short τdecay, while fgas-driven quenching shows a broader range. Overall, 75% of GVs exhibit τdecay shorter than 1 Gyr, suggesting that quenching in most GVs proceeds rapidly, challenging purely slow-quenching scenarios like starvation. |
| 關鍵字 | |
| 語言 | zh_TW |
| ISSN | |
| 期刊性質 | 國外 |
| 收錄於 | SCI |
| 產學合作 | |
| 通訊作者 | |
| 審稿制度 | 是 |
| 國別 | USA |
| 公開徵稿 | |
| 出版型式 | ,電子版 |
| 相關連結 |
機構典藏連結 ( http://tkuir.lib.tku.edu.tw:8080/dspace/handle/987654321/129221 ) |